Cita APA (7a ed.)

Collins, M. N., & Morris, M. G. (1985). Threatened swllowtail butterflies of the world. IUCN.

Cita Chicago Style (17a ed.)

Collins, Mark N., y Michael G. Morris. Threatened Swllowtail Butterflies of the World. Gland, Switzerland: IUCN, 1985.

Cita MLA (9a ed.)

Collins, Mark N., y Michael G. Morris. Threatened Swllowtail Butterflies of the World. IUCN, 1985.